Problem Description DP extended display: When hot-plugging the downstream DP port, there is no audio output. (Occurs randomly) 2. Setup Condition The product is connected to the following platform: Platform: Apple MacBook Pro (16-inch, M4 Max, 2024) The DP port is connected to the following monitor: 3. Reproduction Procedure Step 1: Connect the DP port to the extended display ASUS VP28U (4K 60Hz) Step 2: Connect the platform Apple MacBook Pro (16-inch, M4 Max, 2024) Step 3: Hot-plug the downstream DP port → no audio output (random occurrence) Bug Description DP extended display: When hot-plugging the downstream DP port, there is no audio output. (Random) Affected Platform & Monitor Combination Apple MacBook Pro (16-inch, M4 Max, 2024) & Samsung S32BG850NC (4K 240Hz) Vendor Anaysis: After analysis, we found that the issue also fails when the host is directly connected to the monitor (tested with two different USB-C to DP cables, both showing the same failure). The RTS5490 only bypasses the audio and video signals, and no abnormal behavior was observed in the logs. In addition, we found that different behaviors occur when switching the monitor OSD between DP 1.1 and DP 1.2: OSD set to DP 1.1: Direct connection: Pass Connected through RTS5490: Pass OSD set to DP 1.2: Direct connection: Fail Connected through RTS5490: Fail (same issue reported by Tongxing) Testing with other monitors does no

Problem Description When the Type-C port is connected to an ASUS ROG Swift OLED PG32UCDM monitor set to 3840×2160 @ 120 Hz, and the DP port is connected to a Samsung U28E590D monitor set to 3840×2160 @ 60 Hz, the DP port shows no response and no video output after the system wakes from sleep. The DP monitor is not detected. Reproduction Steps Apple MacBook Pro (14-inch ,2024) connect the DP port to Samsung U28E590D and set the resolution to 3840×2160 @ 60 Hz. Connect the Type-C port to ASUS ROG Swift OLED PG32UCDM and set the resolution to 3840×2160 @ 120 Hz. Put the platform into sleep mode, then wake it up. After wake-up, the DP port has no response and no video output. Bug Description When the Type-C port is connected to an ASUS ROG Swift OLED PG32UCDM at 3840×2160 @ 120 Hz, and the DP port is connected to a Samsung U28E590D at 3840×2160 @ 60 Hz, the DP port fails to output video after system sleep and wake-up, and the monitor is not detected.

Problem description: Connected to a Sharp 8TC60DWTX (8K) display, but unable to select 4K resolution Setup Condition Apple MacBook Pro 16-inch M4 Max Sharp 8TC60DWTX (8K) 3.Duplicate Procedure After connecting to 8K MNT and select 4K solution, it still display as 8K. Vendor analysis: 8K60 shows no image; switching to 30 Hz works normally → After analysis, we found that the 8K60 timing output from the MacBook is incorrect. The horizontal blanking (H-CBlanking) is too small to accommodate the audio data, so the RTD2191E does not output video to the monitor. → This issue does not occur on Windows platforms, confirming that this is a host-side issue.

We attempted to run a burn-in test while connected to our MacBook Pro M4 Max, but this crashed about 10 minutes into testing. We tried to run a 2-hour burn-in on M4 Max host while charging the battery from below 5%, running six bus-powered drives (via ATTO/Black Magic/IOmeter), hitting the RJ45 port for 2.5Gbps (via JPerf), and streaming at least 4K60Hz video content to two display, however, M4 Max will crashed in 20 [minutes.]( https://www.example.com/)

We attempted to run a burn-in test while connected to our MacBook Pro M4 Max, but this crashed about 10 minutes into testing. Can Action Star see if you are able to run a 2-hour burn-in on your own M4 Max host while charging the battery from below 5%, running six bus-powered drives (via ATTO/Black Magic/IOmeter), hitting the RJ45 port for 2.5Gbps (via JPerf), and streaming at least 4K60Hz video content to two displays? Please measure the outer temperature on the hottest part of the enclosure as well.